Jasconian Isle is a rare Land Creature — Island Fish card from Mystery Booster Playtest Cards 2021 (CMB2), collector number 117. Current market price: $0.33, TCGplayer market prices via Scryfall.
(Jasconian Isle isn't a spell, it's affected by summoning sickness, it's blue, and it has "{T}: Add {U}.") Jasconian Isle enters tapped. Jasconian Isle doesn't untap during your untap step. At the beginning of your upkeep, you may pay {U}{U}. If you do, untap Jasconian Isle.